| SOLUTION: Displaying plots on X-terminals: backing pixmap doesn't get set? [message #994] |
Tue, 13 April 1993 12:31 |
kashyap
Messages: 26
Registered: April 1993
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Junior Member |
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In article <1993Apr13.163701.21016@midway.uchicago.edu> kashyap@oddjob.uchicago.edu (Vinay Kashyap) writes:
> Hi,
>
> I use a Visual TX100M X-terminal (currently with 2-Meg memory) sometimes to
> display IDL plots, and for some reason, the backing pixmap does not get set.
> So whenever I cover/uncover the plot window, the covered part comes out
> blank. It gets rather annoying when one is trying to build up a complicated
> plot. I would appreciate any suggestions/hints to avoid this problem.
>
> I have the same problem with ghostview, but that I can live with.
>
> terminal windows, clocks, xload, etc., do NOT exhibit this problem. i.e.,
> when I cover an xterm window with another and uncover it, I can still see all
> the stuff that was covered.
The solution is quite simple, as it turns out (Thanks to Jim Pendleton and
Eric Deutsch):
Most workstations take care of "backing store", but X Terminals do not.
use:
IDL> device,retain=2
as soon as you enter IDL (before opening ANY graphics windows) to
tell IDL to supply the backing store itself...
or
IDL> window,retain=2
When you create your windows
Vinay
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